fpdfsdk/src/fpdf_transformpage.cpp - platform/external/pdfium - Gitiles

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

 #include "../include/fsdk_define.h"
 #include "../include/fpdf_transformpage.h"
 #include "../include/fpdfxfa/fpdfxfa_doc.h"
 #include "../include/fpdfxfa/fpdfxfa_page.h"

 DLLEXPORT void STDCALL FPDFPage_SetMediaBox(FPDF_PAGE page, float left, float bottom, float right, float top)
 {
 	if(!page)
 		return;
 	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
 	if (!pPage) return;
 	CPDF_Dictionary* pPageDict = pPage->m_pFormDict;
 	CPDF_Array* pMediaBoxArray = FX_NEW CPDF_Array;
 	pMediaBoxArray->Add(FX_NEW CPDF_Number(left));
 	pMediaBoxArray->Add(FX_NEW CPDF_Number(bottom));
 	pMediaBoxArray->Add(FX_NEW CPDF_Number(FX_FLOAT(right)));
 	pMediaBoxArray->Add(FX_NEW CPDF_Number(FX_FLOAT(top)));

 	pPageDict->SetAt("MediaBox", pMediaBoxArray);
 }


 DLLEXPORT void STDCALL FPDFPage_SetCropBox(FPDF_PAGE page, float left, float bottom, float right, float top)
 {
 	if(!page)
 		return;
 	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
 	if (!pPage) return;
 	CPDF_Dictionary* pPageDict = pPage->m_pFormDict;
 	CPDF_Array* pCropBoxArray = FX_NEW CPDF_Array;
 	pCropBoxArray->Add(FX_NEW CPDF_Number(left));
 	pCropBoxArray->Add(FX_NEW CPDF_Number(bottom));
 	pCropBoxArray->Add(FX_NEW CPDF_Number(FX_FLOAT(right)));
 	pCropBoxArray->Add(FX_NEW CPDF_Number(FX_FLOAT(top)));


 	pPageDict->SetAt("CropBox", pCropBoxArray);
 }


 DLLEXPORT FX_BOOL STDCALL FPDFPage_GetMediaBox(FPDF_PAGE page, float* left, float* bottom, float* right, float* top)
 {
 	if(!page)
 		return FALSE;
 	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
 	if (!pPage) return FALSE;
 	CPDF_Dictionary* pPageDict = pPage->m_pFormDict;
 	CPDF_Array* pArray = pPageDict->GetArray("MediaBox");
 	if(pArray)
 	{
 		*left = pArray->GetFloat(0);
 		*bottom = pArray->GetFloat(1);
 		*right = pArray->GetFloat(2);
 		*top = pArray->GetFloat(3);
 		return TRUE;
 	}
 	return FALSE;
 }

 DLLEXPORT FPDF_BOOL STDCALL FPDFPage_GetCropBox(FPDF_PAGE page, float* left, float* bottom, float* right, float* top)
 {
 	if(!page)
 		return FALSE;
 	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
 	if (!pPage) return FALSE;
 	CPDF_Dictionary* pPageDict = pPage->m_pFormDict;
 	CPDF_Array* pArray = pPageDict->GetArray("CropBox");
 	if(pArray)
 	{
 		*left = pArray->GetFloat(0);
 		*bottom = pArray->GetFloat(1);
 		*right = pArray->GetFloat(2);
 		*top = pArray->GetFloat(3);
 		return TRUE;
 	}
 	return FALSE;
 }

 DLLEXPORT FPDF_BOOL STDCALL FPDFPage_TransFormWithClip(FPDF_PAGE page, FS_MATRIX* matrix, FS_RECTF* clipRect)
 {
 	if(!page)
 		return FALSE;

 	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
 	if (!pPage)
 		return FALSE;

 	CFX_ByteTextBuf textBuf;
 	textBuf<<"q ";
 	CFX_FloatRect rect(clipRect->left, clipRect->bottom, clipRect->right, clipRect->top);
 	rect.Normalize();
 	CFX_ByteString bsClipping;
 	bsClipping.Format("%f %f %f %f re W* n ", rect.left, rect.bottom, rect.Width(), rect.Height());
 	textBuf<<bsClipping;

 	CFX_ByteString bsMatix;
 	bsMatix.Format("%f %f %f %f %f %f cm ", matrix->a, matrix->b,matrix->c,matrix->d,matrix->e,matrix->f);
 	textBuf<<bsMatix;


 	CPDF_Dictionary* pPageDic = pPage->m_pFormDict;
 	CPDF_Object* pContentObj = pPageDic ? pPageDic->GetElement("Contents") : NULL;
 	if(!pContentObj)
 		pContentObj = pPageDic ? pPageDic->GetArray("Contents") : NULL;
 	if(!pContentObj)
 		return FALSE;

 	CPDF_Dictionary* pDic = FX_NEW CPDF_Dictionary;
 	CPDF_Stream* pStream = FX_NEW CPDF_Stream(NULL,0, pDic);
 	pStream->SetData(textBuf.GetBuffer(), textBuf.GetSize(), FALSE, FALSE);
 	CPDF_Document* pDoc = pPage->m_pDocument;
 	if(!pDoc)
 		return FALSE;
 	pDoc->AddIndirectObject(pStream);

 	pDic = FX_NEW CPDF_Dictionary;
 	CPDF_Stream* pEndStream = FX_NEW CPDF_Stream(NULL,0, pDic);
 	pEndStream->SetData((FX_LPCBYTE)" Q", 2, FALSE, FALSE);
 	pDoc->AddIndirectObject(pEndStream);

 	CPDF_Array* pContentArray = NULL;
 	if (pContentObj && pContentObj->GetType() == PDFOBJ_ARRAY)
 	{
 		pContentArray = (CPDF_Array*)pContentObj;
 		CPDF_Reference* pRef = FX_NEW CPDF_Reference(pDoc, pStream->GetObjNum());
 		pContentArray->InsertAt(0, pRef);
 		pContentArray->AddReference(pDoc,pEndStream);

 	}
 	else if(pContentObj && pContentObj->GetType() == PDFOBJ_REFERENCE)
 	{
 		CPDF_Reference* pReference = (CPDF_Reference*)pContentObj;
 		CPDF_Object* pDirectObj = pReference->GetDirect();
 		if(pDirectObj != NULL)
 		{
 			if(pDirectObj->GetType() == PDFOBJ_ARRAY)
 			{
 				pContentArray = (CPDF_Array*)pDirectObj;
 				CPDF_Reference* pRef = FX_NEW CPDF_Reference(pDoc, pStream->GetObjNum());
 				pContentArray->InsertAt(0, pRef);
 				pContentArray->AddReference(pDoc,pEndStream);

 			}
 			else if(pDirectObj->GetType() == PDFOBJ_STREAM)
 			{
 				pContentArray = FX_NEW CPDF_Array();
 				pContentArray->AddReference(pDoc,pStream->GetObjNum());
 				pContentArray->AddReference(pDoc,pDirectObj->GetObjNum());
 				pContentArray->AddReference(pDoc, pEndStream);
 				pPageDic->SetAtReference("Contents", pDoc, pDoc->AddIndirectObject(pContentArray));
 			}
 		}
 	}

 	//Need to transform the patterns as well.
 	CPDF_Dictionary* pRes = pPageDic->GetDict(FX_BSTRC("Resources"));
 	if(pRes)
 	{
 		CPDF_Dictionary* pPattenDict = pRes->GetDict(FX_BSTRC("Pattern"));
 		if(pPattenDict)
 		{
 			FX_POSITION pos = pPattenDict->GetStartPos();
 			while(pos)
 			{
 				CPDF_Dictionary* pDict = NULL;
 				CFX_ByteString key;
 				CPDF_Object* pObj = pPattenDict->GetNextElement(pos, key);
 				if(pObj->GetType() == PDFOBJ_REFERENCE)
 					pObj = pObj->GetDirect();
 				if(pObj->GetType() == PDFOBJ_DICTIONARY)
 				{
 					pDict = (CPDF_Dictionary*)pObj;
 				}
 				else if(pObj->GetType() == PDFOBJ_STREAM)
 				{
 					pDict = ((CPDF_Stream*)pObj)->GetDict();
 				}
 				else
 					continue;

 				CFX_AffineMatrix m = pDict->GetMatrix(FX_BSTRC("Matrix"));
 				CFX_AffineMatrix t = *(CFX_AffineMatrix*)matrix;
 				m.Concat(t);
 				pDict->SetAtMatrix(FX_BSTRC("Matrix"), m);
 			}
 		}
 	}

 	return TRUE;
 }

 DLLEXPORT void STDCALL FPDFPageObj_TransformClipPath(FPDF_PAGEOBJECT page_object,double a, double b, double c, double d, double e, double f)
 {
 	CPDF_PageObject* pPageObj = (CPDF_PageObject*)page_object;
 	if(pPageObj == NULL)
 		return;
 	CFX_AffineMatrix matrix((FX_FLOAT)a,(FX_FLOAT)b,(FX_FLOAT)c,(FX_FLOAT)d,(FX_FLOAT)e,(FX_FLOAT)f);

 	//Special treatment to shading object, because the ClipPath for shading object is already transformed.
 	if(pPageObj->m_Type != PDFPAGE_SHADING)
 		pPageObj->TransformClipPath(matrix);
 	pPageObj->TransformGeneralState(matrix);
 }


 DLLEXPORT FPDF_CLIPPATH STDCALL FPDF_CreateClipPath(float left, float bottom, float right, float top)
 {
 	CPDF_ClipPath* pNewClipPath =  FX_NEW CPDF_ClipPath();
 	pNewClipPath->GetModify();
 	CPDF_Path Path;
 	Path.GetModify();
 	Path.AppendRect(left, bottom, right, top);
 	pNewClipPath->AppendPath(Path, FXFILL_ALTERNATE, FALSE);
 	return pNewClipPath;
 }

 DLLEXPORT void STDCALL FPDF_DestroyClipPath(FPDF_CLIPPATH clipPath)
 {
 	if(clipPath)
 		delete (CPDF_ClipPath*)clipPath;
 }

 void OutputPath(CFX_ByteTextBuf& buf, CPDF_Path path)
 {
 	const CFX_PathData* pPathData = path;
 	if (pPathData == NULL) return;

 	FX_PATHPOINT* pPoints = pPathData->GetPoints();

 	if (path.IsRect()) {
 		buf << (pPoints[0].m_PointX) << " " << (pPoints[0].m_PointY) << " "
 			<< (pPoints[2].m_PointX - pPoints[0].m_PointX) << " "
 			<< (pPoints[2].m_PointY - pPoints[0].m_PointY) << " re\n";
 		return;
 	}

 	CFX_ByteString temp;
 	for (int i = 0; i < pPathData->GetPointCount(); i ++) {
 		buf << (pPoints[i].m_PointX) << " " << (pPoints[i].m_PointY);
 		int point_type = pPoints[i].m_Flag & FXPT_TYPE;
 		if (point_type == FXPT_MOVETO)
 			buf << " m\n";
 		else if (point_type == FXPT_BEZIERTO) {
 			buf << " " << (pPoints[i+1].m_PointX) << " " << (pPoints[i+1].m_PointY) << " " <<
 				(pPoints[i+2].m_PointX) << " " << (pPoints[i+2].m_PointY);
 			if (pPoints[i+2].m_Flag & FXPT_CLOSEFIGURE)
 				buf << " c h\n";
 			else
 				buf << " c\n";
 			i += 2;
 		} else if (point_type == FXPT_LINETO) {
 			if (pPoints[i].m_Flag & FXPT_CLOSEFIGURE)
 				buf << " l h\n";
 			else
 				buf << " l\n";
 		}
 	}
 }

 DLLEXPORT void STDCALL FPDFPage_InsertClipPath(FPDF_PAGE page,FPDF_CLIPPATH clipPath)
 {
 	if(!page)
 		return;
 	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
 	if (!pPage) return;
 	CPDF_Dictionary* pPageDic = pPage->m_pFormDict;
 	CPDF_Object* pContentObj = pPageDic ? pPageDic->GetElement("Contents") : NULL;
 	if(!pContentObj)
 		pContentObj = pPageDic ? pPageDic->GetArray("Contents") : NULL;
 	if(!pContentObj)
 		return;

 	CFX_ByteTextBuf strClip;
 	CPDF_ClipPath* pClipPath = (CPDF_ClipPath*)clipPath;
 	FX_DWORD i;
 	for (i = 0; i < pClipPath->GetPathCount(); i ++) {
 		CPDF_Path path = pClipPath->GetPath(i);
 		int iClipType = pClipPath->GetClipType(i);
 		if (path.GetPointCount() == 0) {
 			// Empty clipping (totally clipped out)
 			strClip << "0 0 m W n ";
 		} else {
 			OutputPath(strClip, path);
 			if (iClipType == FXFILL_WINDING)
 				strClip << "W n\n";
 			else
 				strClip << "W* n\n";
 		}
 	}
 	CPDF_Dictionary* pDic = FX_NEW CPDF_Dictionary;
 	CPDF_Stream* pStream = FX_NEW CPDF_Stream(NULL,0, pDic);
 	pStream->SetData(strClip.GetBuffer(), strClip.GetSize(), FALSE, FALSE);
 	CPDF_Document* pDoc = pPage->m_pDocument;
 	if(!pDoc)
 		return;
 	pDoc->AddIndirectObject(pStream);

 	CPDF_Array* pContentArray = NULL;
 	if (pContentObj && pContentObj->GetType() == PDFOBJ_ARRAY)
 	{
 		pContentArray = (CPDF_Array*)pContentObj;
 		CPDF_Reference* pRef = FX_NEW CPDF_Reference(pDoc, pStream->GetObjNum());
 		pContentArray->InsertAt(0, pRef);

 	}
 	else if(pContentObj && pContentObj->GetType() == PDFOBJ_REFERENCE)
 	{
 		CPDF_Reference* pReference = (CPDF_Reference*)pContentObj;
 		CPDF_Object* pDirectObj = pReference->GetDirect();
 		if(pDirectObj != NULL)
 		{
 			if(pDirectObj->GetType() == PDFOBJ_ARRAY)
 			{
 				pContentArray = (CPDF_Array*)pDirectObj;
 				CPDF_Reference* pRef = FX_NEW CPDF_Reference(pDoc, pStream->GetObjNum());
 				pContentArray->InsertAt(0, pRef);

 			}
 			else if(pDirectObj->GetType() == PDFOBJ_STREAM)
 			{
 				pContentArray = FX_NEW CPDF_Array();
 				pContentArray->AddReference(pDoc,pStream->GetObjNum());
 				pContentArray->AddReference(pDoc,pDirectObj->GetObjNum());
 				pPageDic->SetAtReference("Contents", pDoc, pDoc->AddIndirectObject(pContentArray));
 			}
 		}
 	}
 }
	// Copyright 2014 PDFium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

	#include "../include/fsdk_define.h"
	#include "../include/fpdf_transformpage.h"
	#include "../include/fpdfxfa/fpdfxfa_doc.h"
	#include "../include/fpdfxfa/fpdfxfa_page.h"

	DLLEXPORT void STDCALL FPDFPage_SetMediaBox(FPDF_PAGE page, float left, float bottom, float right, float top)
	{
	if(!page)
	return;
	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
	if (!pPage) return;
	CPDF_Dictionary* pPageDict = pPage->m_pFormDict;
	CPDF_Array* pMediaBoxArray = FX_NEW CPDF_Array;
	pMediaBoxArray->Add(FX_NEW CPDF_Number(left));
	pMediaBoxArray->Add(FX_NEW CPDF_Number(bottom));
	pMediaBoxArray->Add(FX_NEW CPDF_Number(FX_FLOAT(right)));
	pMediaBoxArray->Add(FX_NEW CPDF_Number(FX_FLOAT(top)));

	pPageDict->SetAt("MediaBox", pMediaBoxArray);
	}


	DLLEXPORT void STDCALL FPDFPage_SetCropBox(FPDF_PAGE page, float left, float bottom, float right, float top)
	{
	if(!page)
	return;
	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
	if (!pPage) return;
	CPDF_Dictionary* pPageDict = pPage->m_pFormDict;
	CPDF_Array* pCropBoxArray = FX_NEW CPDF_Array;
	pCropBoxArray->Add(FX_NEW CPDF_Number(left));
	pCropBoxArray->Add(FX_NEW CPDF_Number(bottom));
	pCropBoxArray->Add(FX_NEW CPDF_Number(FX_FLOAT(right)));
	pCropBoxArray->Add(FX_NEW CPDF_Number(FX_FLOAT(top)));


	pPageDict->SetAt("CropBox", pCropBoxArray);
	}


	DLLEXPORT FX_BOOL STDCALL FPDFPage_GetMediaBox(FPDF_PAGE page, float* left, float* bottom, float* right, float* top)
	{
	if(!page)
	return FALSE;
	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
	if (!pPage) return FALSE;
	CPDF_Dictionary* pPageDict = pPage->m_pFormDict;
	CPDF_Array* pArray = pPageDict->GetArray("MediaBox");
	if(pArray)
	{
	*left = pArray->GetFloat(0);
	*bottom = pArray->GetFloat(1);
	*right = pArray->GetFloat(2);
	*top = pArray->GetFloat(3);
	return TRUE;
	}
	return FALSE;
	}

	DLLEXPORT FPDF_BOOL STDCALL FPDFPage_GetCropBox(FPDF_PAGE page, float* left, float* bottom, float* right, float* top)
	{
	if(!page)
	return FALSE;
	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
	if (!pPage) return FALSE;
	CPDF_Dictionary* pPageDict = pPage->m_pFormDict;
	CPDF_Array* pArray = pPageDict->GetArray("CropBox");
	if(pArray)
	{
	*left = pArray->GetFloat(0);
	*bottom = pArray->GetFloat(1);
	*right = pArray->GetFloat(2);
	*top = pArray->GetFloat(3);
	return TRUE;
	}
	return FALSE;
	}

	DLLEXPORT FPDF_BOOL STDCALL FPDFPage_TransFormWithClip(FPDF_PAGE page, FS_MATRIX* matrix, FS_RECTF* clipRect)
	{
	if(!page)
	return FALSE;

	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
	if (!pPage)
	return FALSE;

	CFX_ByteTextBuf textBuf;
	textBuf<<"q ";
	CFX_FloatRect rect(clipRect->left, clipRect->bottom, clipRect->right, clipRect->top);
	rect.Normalize();
	CFX_ByteString bsClipping;
	bsClipping.Format("%f %f %f %f re W* n ", rect.left, rect.bottom, rect.Width(), rect.Height());
	textBuf<<bsClipping;

	CFX_ByteString bsMatix;
	bsMatix.Format("%f %f %f %f %f %f cm ", matrix->a, matrix->b,matrix->c,matrix->d,matrix->e,matrix->f);
	textBuf<<bsMatix;


	CPDF_Dictionary* pPageDic = pPage->m_pFormDict;
	CPDF_Object* pContentObj = pPageDic ? pPageDic->GetElement("Contents") : NULL;
	if(!pContentObj)
	pContentObj = pPageDic ? pPageDic->GetArray("Contents") : NULL;
	if(!pContentObj)
	return FALSE;

	CPDF_Dictionary* pDic = FX_NEW CPDF_Dictionary;
	CPDF_Stream* pStream = FX_NEW CPDF_Stream(NULL,0, pDic);
	pStream->SetData(textBuf.GetBuffer(), textBuf.GetSize(), FALSE, FALSE);
	CPDF_Document* pDoc = pPage->m_pDocument;
	if(!pDoc)
	return FALSE;
	pDoc->AddIndirectObject(pStream);

	pDic = FX_NEW CPDF_Dictionary;
	CPDF_Stream* pEndStream = FX_NEW CPDF_Stream(NULL,0, pDic);
	pEndStream->SetData((FX_LPCBYTE)" Q", 2, FALSE, FALSE);
	pDoc->AddIndirectObject(pEndStream);

	CPDF_Array* pContentArray = NULL;
	if (pContentObj && pContentObj->GetType() == PDFOBJ_ARRAY)
	{
	pContentArray = (CPDF_Array*)pContentObj;
	CPDF_Reference* pRef = FX_NEW CPDF_Reference(pDoc, pStream->GetObjNum());
	pContentArray->InsertAt(0, pRef);
	pContentArray->AddReference(pDoc,pEndStream);

	}
	else if(pContentObj && pContentObj->GetType() == PDFOBJ_REFERENCE)
	{
	CPDF_Reference* pReference = (CPDF_Reference*)pContentObj;
	CPDF_Object* pDirectObj = pReference->GetDirect();
	if(pDirectObj != NULL)
	{
	if(pDirectObj->GetType() == PDFOBJ_ARRAY)
	{
	pContentArray = (CPDF_Array*)pDirectObj;
	CPDF_Reference* pRef = FX_NEW CPDF_Reference(pDoc, pStream->GetObjNum());
	pContentArray->InsertAt(0, pRef);
	pContentArray->AddReference(pDoc,pEndStream);

	}
	else if(pDirectObj->GetType() == PDFOBJ_STREAM)
	{
	pContentArray = FX_NEW CPDF_Array();
	pContentArray->AddReference(pDoc,pStream->GetObjNum());
	pContentArray->AddReference(pDoc,pDirectObj->GetObjNum());
	pContentArray->AddReference(pDoc, pEndStream);
	pPageDic->SetAtReference("Contents", pDoc, pDoc->AddIndirectObject(pContentArray));
	}
	}
	}

	//Need to transform the patterns as well.
	CPDF_Dictionary* pRes = pPageDic->GetDict(FX_BSTRC("Resources"));
	if(pRes)
	{
	CPDF_Dictionary* pPattenDict = pRes->GetDict(FX_BSTRC("Pattern"));
	if(pPattenDict)
	{
	FX_POSITION pos = pPattenDict->GetStartPos();
	while(pos)
	{
	CPDF_Dictionary* pDict = NULL;
	CFX_ByteString key;
	CPDF_Object* pObj = pPattenDict->GetNextElement(pos, key);
	if(pObj->GetType() == PDFOBJ_REFERENCE)
	pObj = pObj->GetDirect();
	if(pObj->GetType() == PDFOBJ_DICTIONARY)
	{
	pDict = (CPDF_Dictionary*)pObj;
	}
	else if(pObj->GetType() == PDFOBJ_STREAM)
	{
	pDict = ((CPDF_Stream*)pObj)->GetDict();
	}
	else
	continue;

	CFX_AffineMatrix m = pDict->GetMatrix(FX_BSTRC("Matrix"));
	CFX_AffineMatrix t = (CFX_AffineMatrix)matrix;
	m.Concat(t);
	pDict->SetAtMatrix(FX_BSTRC("Matrix"), m);
	}
	}
	}

	return TRUE;
	}

	DLLEXPORT void STDCALL FPDFPageObj_TransformClipPath(FPDF_PAGEOBJECT page_object,double a, double b, double c, double d, double e, double f)
	{
	CPDF_PageObject* pPageObj = (CPDF_PageObject*)page_object;
	if(pPageObj == NULL)
	return;
	CFX_AffineMatrix matrix((FX_FLOAT)a,(FX_FLOAT)b,(FX_FLOAT)c,(FX_FLOAT)d,(FX_FLOAT)e,(FX_FLOAT)f);

	//Special treatment to shading object, because the ClipPath for shading object is already transformed.
	if(pPageObj->m_Type != PDFPAGE_SHADING)
	pPageObj->TransformClipPath(matrix);
	pPageObj->TransformGeneralState(matrix);
	}


	DLLEXPORT FPDF_CLIPPATH STDCALL FPDF_CreateClipPath(float left, float bottom, float right, float top)
	{
	CPDF_ClipPath* pNewClipPath = FX_NEW CPDF_ClipPath();
	pNewClipPath->GetModify();
	CPDF_Path Path;
	Path.GetModify();
	Path.AppendRect(left, bottom, right, top);
	pNewClipPath->AppendPath(Path, FXFILL_ALTERNATE, FALSE);
	return pNewClipPath;
	}

	DLLEXPORT void STDCALL FPDF_DestroyClipPath(FPDF_CLIPPATH clipPath)
	{
	if(clipPath)
	delete (CPDF_ClipPath*)clipPath;
	}

	void OutputPath(CFX_ByteTextBuf& buf, CPDF_Path path)
	{
	const CFX_PathData* pPathData = path;
	if (pPathData == NULL) return;

	FX_PATHPOINT* pPoints = pPathData->GetPoints();

	if (path.IsRect()) {
	buf << (pPoints[0].m_PointX) << " " << (pPoints[0].m_PointY) << " "
	<< (pPoints[2].m_PointX - pPoints[0].m_PointX) << " "
	<< (pPoints[2].m_PointY - pPoints[0].m_PointY) << " re\n";
	return;
	}

	CFX_ByteString temp;
	for (int i = 0; i < pPathData->GetPointCount(); i ++) {
	buf << (pPoints[i].m_PointX) << " " << (pPoints[i].m_PointY);
	int point_type = pPoints[i].m_Flag & FXPT_TYPE;
	if (point_type == FXPT_MOVETO)
	buf << " m\n";
	else if (point_type == FXPT_BEZIERTO) {
	buf << " " << (pPoints[i+1].m_PointX) << " " << (pPoints[i+1].m_PointY) << " " <<
	(pPoints[i+2].m_PointX) << " " << (pPoints[i+2].m_PointY);
	if (pPoints[i+2].m_Flag & FXPT_CLOSEFIGURE)
	buf << " c h\n";
	else
	buf << " c\n";
	i += 2;
	} else if (point_type == FXPT_LINETO) {
	if (pPoints[i].m_Flag & FXPT_CLOSEFIGURE)
	buf << " l h\n";
	else
	buf << " l\n";
	}
	}
	}

	DLLEXPORT void STDCALL FPDFPage_InsertClipPath(FPDF_PAGE page,FPDF_CLIPPATH clipPath)
	{
	if(!page)
	return;
	CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
	if (!pPage) return;
	CPDF_Dictionary* pPageDic = pPage->m_pFormDict;
	CPDF_Object* pContentObj = pPageDic ? pPageDic->GetElement("Contents") : NULL;
	if(!pContentObj)
	pContentObj = pPageDic ? pPageDic->GetArray("Contents") : NULL;
	if(!pContentObj)
	return;

	CFX_ByteTextBuf strClip;
	CPDF_ClipPath* pClipPath = (CPDF_ClipPath*)clipPath;
	FX_DWORD i;
	for (i = 0; i < pClipPath->GetPathCount(); i ++) {
	CPDF_Path path = pClipPath->GetPath(i);
	int iClipType = pClipPath->GetClipType(i);
	if (path.GetPointCount() == 0) {
	// Empty clipping (totally clipped out)
	strClip << "0 0 m W n ";
	} else {
	OutputPath(strClip, path);
	if (iClipType == FXFILL_WINDING)
	strClip << "W n\n";
	else
	strClip << "W* n\n";
	}
	}
	CPDF_Dictionary* pDic = FX_NEW CPDF_Dictionary;
	CPDF_Stream* pStream = FX_NEW CPDF_Stream(NULL,0, pDic);
	pStream->SetData(strClip.GetBuffer(), strClip.GetSize(), FALSE, FALSE);
	CPDF_Document* pDoc = pPage->m_pDocument;
	if(!pDoc)
	return;
	pDoc->AddIndirectObject(pStream);

	CPDF_Array* pContentArray = NULL;
	if (pContentObj && pContentObj->GetType() == PDFOBJ_ARRAY)
	{
	pContentArray = (CPDF_Array*)pContentObj;
	CPDF_Reference* pRef = FX_NEW CPDF_Reference(pDoc, pStream->GetObjNum());
	pContentArray->InsertAt(0, pRef);

	}
	else if(pContentObj && pContentObj->GetType() == PDFOBJ_REFERENCE)
	{
	CPDF_Reference* pReference = (CPDF_Reference*)pContentObj;
	CPDF_Object* pDirectObj = pReference->GetDirect();
	if(pDirectObj != NULL)
	{
	if(pDirectObj->GetType() == PDFOBJ_ARRAY)
	{
	pContentArray = (CPDF_Array*)pDirectObj;
	CPDF_Reference* pRef = FX_NEW CPDF_Reference(pDoc, pStream->GetObjNum());
	pContentArray->InsertAt(0, pRef);

	}
	else if(pDirectObj->GetType() == PDFOBJ_STREAM)
	{
	pContentArray = FX_NEW CPDF_Array();
	pContentArray->AddReference(pDoc,pStream->GetObjNum());
	pContentArray->AddReference(pDoc,pDirectObj->GetObjNum());
	pPageDic->SetAtReference("Contents", pDoc, pDoc->AddIndirectObject(pContentArray));
	}
	}
	}
	}